Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019
Leases
Weighted average remaining lease term	68 months
Right-of-use assets	$ 2,200
Operating lease liabilities	$ 3,489
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:OtherAccruedLiabilitiesNoncurrent us-gaap:AccruedLiabilitiesCurrent
Total lease costs	$ 700
Weighted-average incremental borrowing rate used to determine right-of-use assets and lease liabilities	11.00%
Maturities of operating lease liabilities
2020	$ 807
2021	818
2022	807
2023	823
2024	840
Thereafter	642
Total lease payments	4,737
Less: imputed interest	(1,248)
Total lease liabilities	3,489
Current operating lease liabilities	$ 446
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued Liabilities, Current
Non-current operating lease liabilities	$ 3,043
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other Accrued Liabilities, Noncurrent
Rental expense		$ 200
Annual future minimum lease payments
2019		298
2020		807
2021		819
2022		807
2023		823
Thereafter		1,482
Total minimum lease payments		$ 5,036
Restatement Adjustment | Accounting Standards Update 2016-02
Leases
ROU adjustment for lease incentives			$ 900
Right-of-use assets			2,500
Operating lease liabilities			3,400
Maturities of operating lease liabilities
Total lease liabilities			$ 3,400
Minimum
Leases
Operating lease agreement term	36 months
Operating lease renewal term	24 years
Maximum
Leases
Operating lease agreement term	78 months
Operating lease renewal term	60 years
Short-term operating lease costs	$ 100